2025 SURGE Collaboration Meeting and Workshop

Session

Wednesday Session

25 Jun 2025, 09:00

4-330 (Physics and Astronomy Building)

39. What do we talk about when we talk about saturation?

Peter Martin Jacobs (Lawrence Berkeley National Lab. (US))

25/06/2025, 09:00

26. SIDIS in the target fragmentation region at small x

Farid Salazar (Institute for Nuclear Theory, University of Washington)

25/06/2025, 09:25

Single inclusive hadron production in Deep Inelastic Scattering serves as standard candle observable for probing the 3D partonic structure of proton or nuclear targets. In this talk, I will focus on particle production in the target fragmentation region. At moderate Bjorken-x, this kinematic regime is described by the framework of transverse momentum dependent (TMD) fracture functions. To...

40. CSS evolution as renormalization of a non-local composite operator

Jamal Jalilian-Marian

25/06/2025, 09:50

21. Born-Oppenheimer Renormalization group for High Energy Scattering

Dr Haowu Duan (University of Connecticut)

25/06/2025, 10:45

We develop an approach to QCD evolution based on the sequential Born-Oppenheimer approximations that include higher and higher frequency modes as the evolution parameter is increased. This Born-Oppenheimer renormalization group is a general approach which is valid for the high energy evolution as well as the evolution in transverse resolution scale $Q^2$. We found that the evolution equation...

4. Small-$x$ Helicity Evolution: First Study on the Impact of Polarized $pp$ Scattering Data

Nicholas Baldonado (New Mexico State University)

25/06/2025, 11:10

We perform a phenomenological study of helicity-dependent parton distribution functions (hPDFs) using the KPS-CTT small-$x$ helicity evolution equations. Specifically, this new work presents the first study of the influence of polarized proton-proton ($pp$) scattering data whilst simultaneously analyzing inclusive and semi-inclusive deep-inelastic scattering data, all at $x < 0.1$. Polarized...

20. Weizs\"acker-Williams Gluon Helicity Distribution and Inclusive Dijet Production in Longitudinally Polarized Electron-Proton Collisions

Ming Li (The Ohio State University)

25/06/2025, 11:35

It is well-known that the back-to-back (correlation) limit of inclusive quark--antiquark dijet production in unpolarized high energy electron--proton collisions can probe the Weizs\"{a}cker-Williams (WW) gluon transverse momentum-dependent distribution (TMD) at small $x$. In this paper, we consider a helicity-dependent version of the same process: we study the double-spin asymmetry for...

19. Closing Remarks

Zhongbo Kang (UCLA), Bjoern Schenke (Brookhaven National Lab)

25/06/2025, 12:00